>>724715994 (OP)
After Halo 2 was an absolute fucking nightmare with a good third or more of the game cut and crunch time out the ass, Bungie expanded greatly. Restructured, reorganized, refigured. At least a couple hundred more employees if I remember right. 3's development had its own issues but there isn't enough info to sum it up. What we do know is that Jason Jones and Joe Staten, fucked by Microsoft work ethics, disagreements and exhaustion over 2, took huge vacation leave time and functionally ditched, so 3 had to improvise itself with a made-by-committee structure inside the new Bungie to cook up a new story with no plans besides the cut content examples of 2.
The result was, effectively, a hype game more than it was a planned game. Reminder, Halo 2 was supposed to be the end and not require a sequel besides maybe confronting the Flood remnants, as it was originally going to tackle the Ark, kill the Prophets, destroy the Covenant, and reveal the Humans = Forerunner. With basically all of that cut, they didn't have much room but to improvise, and they technically hit all those beats but in a completely different way (like the Ark originally being ON the Earth instead of some random ass fuckoff portal). This also isn't helped by, as Jaime himself as posted recently in the Campaign Evolved rants about it missing the point of CE, Frankie and a "proto-343" team silently starting to write their own separate ideas of lore into the game on the Terminals under everyone's noses, to the point that the rest of Bungie legitimately didn't even know they were in the game until right before going gold.
Too many cooks, and not enough supervision, plus pure improvisation royally fucked 3's story and lore.